Vehicle brake



Pl' 1931- A. c. MATHIEUSON 1,801,818

' VEHICLE BRAKE Filed Aug'. 21, 1926 INVENTOR ANDREW C.MATH|ESONATTORNEY Patented Apr. 21, 1931 UNITED STATES ANDREW C. MA'I'HIESON, FEDGEWOOD, PENNSYLVANIA, ASSIGNOR TO THE WESTING- HOUSE AIR BRAKECOMPANY, OF WILMERDING, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIAvnnrcrn BRAKE Applicationfiled August a1, 1926. 'Serial No. 130,711.

This invention relates to automotive brakes, and has for its, principalobject to provide improved means for controlling the brakes on all fourwheels of the vehicle.

In the accompanying drawing; Fig. 1 is a fragmentary plan view, partlyin section, of

a motor. vehicle brake equipment embodying my invention; Fig. 2 a sideelevation, partly in section, of the equipment shown in Fig. 1; Fig. 3 asection on the line 3-3 of Fig. 2; Fig. 4 a plan view of the lost motionportion of the brake operating pull rod; and Fig. 5

a vertical section of the portion shown in iccording to m invention, abrake valve device 1 1s secure to a rear cross member 2 of the .motorvehicle and is of the type having an operating shaft 3,to which issecured an operating arm 4. Said shaft is provided with 'a cam portion5, adapted to operate a stem 6, the brake valve evice being such 1 thatwhen the stem 6 is depressed by the cam 5, fluid under pressure will besupplied to ap ly the brakes at the rear wheels of the 1cle. Brakes arecated b the reference numeral 7.. Each as I front w eel brake isprovided with a rotatable shaft 8 for operating the usual cam (notshown) by which the. brakes are applied, and each shaft is providedvw1th an operating I nected to a pull rod 10.

A transversel .disposed shaft 11 is of the vehicle and is operativelyconnected to a pedal lever 19, so that when the pedal 20 is depressed,the rod-18 will be pulled to ward the left. At an-intermediate point,the pull 18 is provided with an enlarged porqthe pull rod 18 toward theright.

. also provided for each front wheel- 0f the vehicle, one of which isinditoward the left and thereby the arm'17 is rocked, 'so that the shaft11 is rotated and arm 9, which is operatively conthe .cam 5 moves out ofengagement 'with I rmitting said stem to move to release position, inwhich fluid is released at the rear brakes so that the brakes at therear are consequently released. I

'PI'EATENT OFFICE the pull rod 18 and engages at one end a cross member26 of the vehicle and at the other end a sleeve 27, which is secured tosaid pull rod, said spring tending to move Ifitis desired to apply thebrakes, the pedal 20 is depressed, causing a movement of the pull rod 18toward the left. The arm 4 of the brake valve device 1 is thereforeactuated to cause rotation of the shaft 3 and the cam 5, so that thec'am'operates the stem 6 to effect the supply of fiuid'under pressure tothe rear brakes of the vehicle and thus cause the brakes to be applied.

Durin the initial movement of the pedal 20 and t e pull rod 18', theslots 23 in the enlarged portion 21, permit movement ofthe arms 16 arealso rotated to cause a movement tothe right of the pull rods 10 at eachside of the vehicle.

plied at the front wheels of the vehicle.

The further movement of the 'pull rod 18 to apply'the brakes at thefront wheels does not have any effect on the brake valve device, since.this further movement merely causes the camportion- 5 to rotate furtherrod1'8 is permitted to .move toward the 1 right. The initial movement ofthe pull The cam shafts 8 are. then actuated to cause the brakes to beap rod 18 toward the right causes the arm 40f the brake valve device tobe shifted, so that the stem 6,

The movement of the pull rod 18 toward the right also permits movementof the arm 17, so that the shaft 11 rotates with the arm 16 to permitmovement of the ull rod 10 to the left. The cam shaft 8 0 each frontwheel brake is thus rotated so as to eifect the release of the brakes atthe front Wheels of the vehicle.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent, is:

1. In an automotive brake, the combination with a brake valve device forcontrolling the fluid pressure brakes at the rear wheels of the vehicleand mechanical means for operating the brakes at the front wheels of thevehicle, the rear wheel brakes being operated only by fluid pressure andthe front wheel brakes only mechanically, of a pull rod, means operatedby said pull rod for first operating said brake valve device and thensaid mechanical operating means, and a manually operated member foroperating said pull rod.

2. In an automotive brake, the combination with a brake valve device forcontrolling the fiuid pressure brakes at the rear wheels of the vehicleand mechanical means for operating the brakes at the front Wheels of thevehicle, of a pull rod for operating said brake valve device and havinga lost motion connection to said mechanically operated means and amanually operable memher for operating said pull rod.

3. In an automotive brake, the combination with a brake valve device forcontrolling the supply of fluid under pressure for operating the rearwheel brakes and pull rods for mechanically operating the front wheelbrakes, of a main pull rod for operating said brake valve device, alever for actuating said front wheel brake operating ull'rods, andhaving a lost motion connectlon to the main pull rod, and manuallyopgrable means for actuating said main pull ro 4.. In an automotivebrake, the combina tion with a brake valve device for controlling thefiuid under pressure for operating the rear wheel brakes and including astem, and a cam for operating said stem, of apull rod for operatin saidcam, a manually operated member or actuating said pull rod, andmechanical means operated after a movement of said pull rod relative tosaid mechanical means for mechanically operat' he front wheel brakes.

In testimony whereof I have hereunto set my hand. a

ANDREW C. MATHIESON.

